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Juba - an Extraordinary Chimpanzee from the Zagreb Zoo: Craniometrical and Radiological Characteristics

A chimpanzee named Juba was born in Hannover Zoo and moved to the Zagreb Zoo where she died in July 2017, at the age of 32. Juba was a dominant female in the group. She was always the first to approach food and very interested in newly added enrichment objects to their habitat. Juba developed perceptual - motor abilities well and was unique for her painting skills. During the years spent in the Zoo she gave birth to Sara in 1999 and Meggy in 2007. Both times she mated with the same male Boris. Juba suffered from chronic cardiovascular and respiratory diseases and died due to severe haemorrhagic enteritis. After the necropsy her skeleton was prepared for osteological examination and will be displayed for education purposes in Zagreb Zoo. The skull was measured to determine basic craniometric values using callipers. Osteological abnormalities were determined during macroscopic inspection of the skull. The skull X-ray imaging was performed to confirm these abnormalities. The maximum length of Juba’s skull was 195.0 mm while the maximum width was 101.7 mm. Right and left orbital indexes were 112.97 and 88.40, respectively. The skull was asymmetric as there was a right shift of the sagittal plane. The asymmetry was followed by a more ventral position of the right temporomandibular joint compared to the left one. The right infraorbital margin was more concave in shape than the left one. The vomer deviated to the right. The third left upper molar was retained. All other maxillary and mandibular teeth were fully developed. We can only presume that all the mentioned osteological and radiological abnormalities developed due to the molar retention since other potential causes were not found. As far as we know this is the first reported craniometrical description of the chimpanzee.

chimpanzee, craniometry, radiology

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